<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// write.id3v1.php                                             //
// module for writing ID3v1 tags                               //
// dependencies: module.tag.id3v1.php                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.tag.id3v1.php', __FILE__, true);

class getid3_write_id3v1
{
    var $filename;
    var $tag_data;
    var $warnings = array (); // any non-critical errors will be stored here
    var $errors   = array (); // any critical errors will be stored here

    public static function getid3_write_id3v1() {
        return true;
    }

    public static function WriteID3v1() {
        // File MUST be writeable - CHMOD(646) at least
        if (is_writeable($this->filename)) {
            if ($fp_source = @fopen($this->filename, 'r+b')) {

                fseek($fp_source, -128, SEEK_END);
                if (fread($fp_source, 3) == 'TAG') {
                    fseek($fp_source, -128, SEEK_END); // overwrite existing ID3v1 tag
                } else {
                    fseek($fp_source, 0, SEEK_END);    // append new ID3v1 tag
                }

                $new_id3v1_tag_data = getid3_id3v1::GenerateID3v1Tag(
                                                        @$this->tag_data['title'],
                                                        @$this->tag_data['artist'],
                                                        @$this->tag_data['album'],
                                                        @$this->tag_data['year'],
                                                        @$this->tag_data['genreid'],
                                                        @$this->tag_data['comment'],
                                                        @$this->tag_data['track']);
                fwrite($fp_source, $new_id3v1_tag_data, 128);
                fclose($fp_source);
                return true;

            } else {
                $this->errors[] = 'Could not open '.$this->filename.' mode "r+b"';
                return false;
            }
        }
        $this->errors[] = 'File is not writeable: '.$this->filename;
        return false;
    }

    public static function FixID3v1Padding() {
        // ID3v1 data is supposed to be padded with NULL characters, but some taggers incorrectly use spaces
        // This public static function rewrites the ID3v1 tag with correct padding

        // Initialize getID3 engine
        $getID3 = new getID3;
        $getid3->info = $getID3->analyze($this->filename);
        if (isset($getid3->info['tags']['id3v1'])) {
            foreach ($getid3->info['tags']['id3v1'] as $key => $value) {
                $id3v1data[$key] = implode(',', $value);
            }
            $this->tag_data = $id3v1data;
            return $this->WriteID3v1();
        }
        return false;
    }

    public static function RemoveID3v1() {
        // File MUST be writeable - CHMOD(646) at least
        if (is_writeable($this->filename)) {
            if ($fp_source = @fopen($this->filename, 'r+b')) {

                fseek($fp_source, -128, SEEK_END);
                if (fread($fp_source, 3) == 'TAG') {
                    ftruncate($fp_source, filesize($this->filename) - 128);
                } else {
                    // no ID3v1 tag to begin with - do nothing
                }
                fclose($fp_source);
                return true;

            } else {
                $this->errors[] = 'Could not open '.$this->filename.' mode "r+b"';
            }
        } else {
            $this->errors[] = $this->filename.' is not writeable';
        }
        return false;
    }

}

?>